Mechanism for indenting a safety gear for an elevator car

• US 20030183457A1
• Filed: 04/02/2003
• Published: 10/02/2003
• Est. Priority Date: 04/02/2002
• Status: Active Grant

• Current Assignee: Inventio AG (Schindler Holding AG)
• Original Assignee: Inventio AG (Schindler Holding AG)
• Inventors: Hugel, Stefan, Maury, Julien
• Granted Patent: US 7,475,756 B2
• Time in Patent Office: Days
• US Class Current: 187/250
• CPC Class Codes: B66B 5/04 for detecting excessive speed
• CPC Class Codes: B66B 5/046 of the pendulum or rocker arm type
• CPC Class Codes: B66B 5/18 and applying frictional retarding forces

Abstract

In relation with this mechanism for stopping an elevator car is, for the monitoring of the speed of the elevator car, an overspeed governor provided which works based on the swing lever principle, whereby the movement of the elevator car will be transferred by means of a governor rope to the overspeed governor. The governor rope extends itself over the entire shaft height and will be returned at the lower shaft end by means of a deflection sheave and stretched by means of counterweight as well as guided at the upper shaft end over a pulley of the overspeed governor. The ends of the governor rope are fastened on a release mechanics arranged on the elevator car and such release mechanics operates in an emergency a safety gear arranged on the elevator car. With the overspeed of the elevator car a rope brake is released upwards.

Claims

1. A mechanism for engaging a safety gear for an elevator car or counterweight of an elevator in which the elevator includes an overspeed governor supervising the speed of the elevator car which is connected by means of a hoist rope with the counterweight, and in which motion of the elevator car or counterweight is transferred to the overspeed governor by means of a governor rope, the overspeed governor triggering the stopping of the elevator by engagement of the safety gear in an overspeed condition, the mechanism comprising:

a release mechanism operable by means of the governor rope to prevent unwanted engagement of the safety gear, the release mechanism including a locking element for retaining the release mechanism in an unreleased position, the mechanism further comprising an auxiliary rope brake acting on the governor rope to provide a force to activate the release of the release mechanism in an emergency overspeed condition.

2. The mechanism in accordance with claim 1, wherein at least one of the locking element and the auxiliary rope brake have force-applying means chosen based upon the hoisting height of the elevator.

3. The mechanism in accordance with claim 1 or 2, wherein the locking element is a wirewrap connecting the release mechanism with a housing.

4. The mechanism in accordance with claim 1 or 2, wherein the auxiliary rope brake includes at least one auxiliary block, at least one compression spring coupled to the auxiliary block, and a counter-block for the governor rope.

5. The mechanism in accordance with claim 3, wherein the auxiliary rope brake includes at least one auxiliary block, at least one compression spring coupled to the auxiliary block, and a counter-block for the governor rope.